hancock



HENRY J. HANCOCK,

, aient Mire,

OF NEW YORK, Y.:

Lam Patent'No. 105,931, met August 2, 187C.

rMPRcvnMENT m 'nnvzcn Por; TRANSMITTING Romair Marron,

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it maylcoacern:

` or body, a crank or eccentric on the shaft or body to be driven, and a connecting-rod or lever connect-ing tbe said cranks or eccentrica, and working through a guide in a pivot-oscillating fulcrum, the axis ot' which is arranged between an'd parallel with the axes ofthe driving and driven shafts or bodies. v In the accompanying drawingsl Figure 1 is a plan view, illustrating the application of my invention, and l I i Figure 2 is a front view of the. same, with the Iiywheel of the driving-shaft removed.

Similar letters of reference indicate corresponding parts in both figures. l

A is the driving-sbaft, and B, the' driven shaft, arranged parallel with each other, in bearings a a and b b, on the frame H.

O is an eccentric on one end of the driving-shaft, and Y D is a crank having a similar throw on thecorresponding end of the driven shaft.

The veccentric and crank are connected by the rod E, which has-a bearing formed in one endy'to receive the wrist of the crank D, and a hoop for band formed Aon or attached tothe other, to receive the eccentric C.

The length of the rod: or lever E, between the ccntersof the crank-pin bearing and eccentric-hoop or band is equal to the distance between the axes of the two shafts.

F is the oscillating pivot containing the guide fer therod E.

VThis pivot is fitted toa stationary bearing, f, on the frame H, its axis being parallel with and in the same plane with the axes of the shaftsA B. n The guide consists simply ot' an opening made through the said pivot transversely to its axis, ot a size and form for the rod E to slide freely through.

The oscillating pivot is shown in the drawing as being midway' between the two shafts. When it is thus arranged, the distancesotthe centers ot' the eccentrics and crank-wrist from the centers ot' their respective shafts A B, or, in other words, the throw of' the cranks or eccentrics, must be alike; but the oscil latng bearing might be arranged nearer to one `shaft than the other, i-n which case that shaft to which it is nearest has the center of its eccentric or crank ar- ,ranged correspondingly nearer to the center of said 'sh-aft.

The connecting-rod thus A connected by the eccentrics or cranks, and passing through the guide in the oscillating pivot F, has imparted to it, by the driving eccentric, both a reciprocating longitudinal motion and an oscillating or lever-like motion with and from the axis of the pivot F, which may be considered as a fnlcrum, and the said rod or pivotis thereby-.caused to impart rotary motion to the crank of the driven shaft inthe opposite direction to that ot' the driving-slmft, ina very positive manner, there being no dead center throughout the stroke.

This invention is particularly applicable to the transmission of rotary motion, from one shaft to another, ot' sewing-machines, in which, while a very positive motion is required, the noise of gear is objectionable.

Itis obvious that a crank or eccentric may beused on each or either shaft.

What I claim as my invention, and desire to secure by Letters' Patent, is-

The leVerE, arranged tol slide through the oscillating fulcrumjF, in combination with the eeceutrics or cranks C l), substantially as shown and described.

HENRY J. HANCOCK. Witnesses: v

FRED. HAYNES, FERD. TUsCH. 

